1700s Johnsons IN Loudon CO VA

I am looking for any information on Johnson families from Loudon Co, VA in the 1700s. Specifically a family who had a son, Thomas Johnson, who was a blacksmith, who left Loudon Co for Washington Co. VA, then on to Clay County, KY in 1806-ish, following land and salt. Thomas married Susannah House/Howes from Prince George Co., MD in the 1801 before leaving.